How off could this be?

[AZ Erik]

The set up:

36mm PWK's (twins)

V-force3's

Duncan billet intake and (yes a boost bottle)

4 mill stroke on 66.25 bore

21cc Noss cut stroker domes putting down 165 psi (now, it used to be 115)

Clamp ons

Dune port

CPI inframes

5 degree advance

350ft elevation (Glamis)

(Probably going to have to run a 50/50 gas mix)

 

What was in the carbs:

68 pilots

160 mains

Needle clip on the very bottom

(The previous owner had it built and tuned by some shop in PHX, not sure of the shop though but this coupled with the ultra low compression I had is really getting annoying, I'm really not sure what's been done right with this motor) It broke up on the top end pretty good when pinned and had nearly no bottom end, but at the same time the clutch was smoked so I couldn't get a good idea of how well anything was.

 

I'm wondering just how far off this might be for my current set up. I know every bike is different but 68 pilots? Most everything I can find in here is for 34's so I am not sure if I can use most of the stufff I'm reading in here. I'm planning on making a trip to the local shop to pick up pilots and mains and am trying to figure out where to begin.

 

I was thinking of dropping to 65's or 60's on the pilots and making sure I have 165's, 170's, 172's, 175's, and possibly 180's. It was obviously running lean on the last trip so I'll be going up no matter what, I also centered the needles.

 

I'm still looking at getting a single set up for this bike, iff you have something let me know as well.

[dajogejr]

I'd say the mains are probably pretty close...but those pilots are HUGE!!! You normally don't even need that big to run alky...lol.

 

Yeah, I'd say you could probably safely go down quite a few sizes on your pilots.

 

You could probably go 50ish on the pilots....to be honest.

[AZ Erik]

That would probably explain the air screw being 4.5 turns out

 

I'll grab some 55's probably some 60's as well. How can I tell if the pilot is correct. These effect 0 to 1/8th or 1/4 throttle right?

 

Thanks for the quick reply

Edited October 25, 2006 by AZ Erik

[dajogejr]

Clean response off idle to just under 1/4 throttle...

Uh...yeah, 4.5 turns out...go way smaller...start with like 55's.

 

.5 to 2.5 is really where you wanna be...

[AZ Erik]

Clean response off idle to just under 1/4 throttle...

Uh...yeah, 4.5 turns out...go way smaller...start with like 55's.

 

.5 to 2.5 is really where you wanna be...

 

Popped 55's in and also threw in a set of 165 mains. I have bottom end now but anything over 1/4 throttle just falls on it's face, Like I fflipped the run switch off. It was behaving like this out at the dunes with the 68's and 160's in it but not as bad. This typically means too much gas right? I was thinking of popping in some 155's or 158's once I get out there. I should go down from this point right? possibly 152's?

 

It's still hard to start. I can click the cchoke on one carb and fire it up but it still acts like it needs to be choked when it's warmed up. I have to kick it fast. My other one fires in half a kick while sitting down. This one needs to be jumped on with the choke on. I'm currently 1.5 turns out with the 155 pilots and 165 mains. I can litterally hammmer it and have it fall on it's ass, then let off and hammer it again and have it just nail the powerband, no clutching and at the same speed in the same gear. Makes no sense to me. I also have no idea what needle is in these carbs I hear a lot about other needle tapers and the Jetting faq would be pointing to my needle for the issues I'm having.

Edited October 26, 2006 by AZ Erik